Improvement in let-off mechanism for looms



N. PErElls, PHMWLITHOGMPMER. WAS

Ctlrtrd gitarist @anni @wie LEONARD C. BRIGGS AND ALBERT HOWARD, OF BOSTON, MASSA- CHUSETTS.

Letters .Patent No. 91,207, dated June 15, 1869.

' IMPROVEMENT IN LET-OFF MECHANISM FOR LOOMS.

The Schedule referred to'in these Letters Patent and making part of the same.

*MOH- .To all 'whom 'it 'nm/y conce/ra:

Beit known that we, LEONARD O. Bares-s and AL- BERT HOWARD, both of Boston,.in the county of Suffolk, and State of Massachusetts, have invented eertain new and useful Improvements in Let-Offs for Looms; and we do hereby leclarethat the following is' a full and exact description thereof,t reference being had to the accompanying drawings, and to the letters of referencemarked thereon.

To enable others skilled in tlieart to make and use our invention, we will proceed to describe its construction'and use.

Drawings.

The drawing represents, in perspective, our invention.

As our invention relates to let-off' for looms, we have only shown the beam, with our improvement attached.

D represents the beam, upon which the warp is Wound.

B and B are two standards, connected with the other parts of the loom.

F ff' is a frame, which slides up and down in the standards H and H', ahd carries the friction-wheel W.

The ends a a ofthe lo'wer bar F of the frame, that carries the friction-wheel W, extend outward, as shown,

L and L' are two levers, hung upon brackets, O and O', and pivoted at 1r and p.

The ends Zand Z', of the levers L and L', act as brakes upon the ends or heads D'and D of the beam D, said brakes being operated by the t'ame F ff'aeting through the springs S and S.

The action of our device is this:

The friction-roll W, and its carrying-frame Fff', bein-g governed by the amount of Warp on the beam, that is, it' the beam is full, the frame F f f' will be pressed down, and, acting through the springs S and S', will cause the brakes L and Z, and L' and Z,'to operate against D and D", and thus oler resistance to the movement of the warp.

As the warp unwinds, the frame F ff is raised up, and, exerting less force upon the brakes, allows the beam to turny more freely. In other words, the friction caused by the brakes is exactly in proportion to the amount of warp upon the beam, and is regulated by the warp itself. i

The springs S S may be-made of any suitable material, and are arranged so that they may be moved along on a and L, bywhich action the leverage on the brakes is changed, that is, the pressure may be adjusted to suit different kinds of' warp.

Having thusdescribed our invention, we will proceed to set forth our claim.

Ola/im.

The combination and arrangement of the beam D, wheel W, frame fj" F, levers L L', and springs S S', as described, and for the purpose set forth.

LEONARD C. BRIGGS. ALBERT HOWARD.

Witnesses:

FRANK G. PARKER, A. HUN BERRY. 

